Number: JOP029
JOINT CDS/SUMER PROGRAMME
Filament Flows with SUMER and CDS
Authors: O. Engvold, J. Zirker, A. Poland
Introduction:
The source of mass for quiescent filaments is still an open
question. According to current thinking, the mass is injected from
the chromosphere, possibly along the long appendages ("feet"
or "barbs") rather than by condensation of coronal matter.
Indeed, recent observations by S. Martin and O. Engvold based on
high-resolution H-alpha filtergrams, supports this view. The
purpose of this program is to acquire SUMER and CDS spectra to test
this idea further. Doppler velocities in selected lines formed at
different temperatures will be observed in a suitable filament
with SUMER. Intensity variations and Doppler velocities of lines
covering a larger range in temperature, in the transition
region and vicinity of the filament, will be observed with CDS to
search for evidence of cooling of coronal plasma and collapse
into the filament.
Transverse and line-of-sight flows in filament fine structure and
associated filament channel will be searched for in simultaneous
high-resolution images from ground-based observatories.
CDS
Study Detail
Phase 1
- -------
Spectrometer: Normal Incidence
Slit: 2 x 240 arcseconds
Raster Area: 120 x 240 arcseconds
Step (DX,DY): 2 arcseconds, 0 arcseconds
Raster Locations: 60 x 1 = 60
Exposure Time: 30 seconds
Duration of Raster: 2084 seconds
Number of Rasters: 5
Total Duration: 10420 seconds
Line Selection: Mg IX 368.06, O III 525.80, He I 537.03
Ne VI 562.83, He I 584.33, O III 599.59,
Mg X 624.94, O V 629.73
Bins Across Line: 21
Telemetry/Compression: truncate to 12 bits
Pointing: To pre-planned location (Filament)
Flags: No flag during this study
Solar Feature Tracking: On
Frequency:
Product Five 120 x 240 arcseconds rasters
Total duration 173.7 minutes
Joint Observation SUMER
If possible, it is desirable that the start of
each scanning sequence is coordinated with the
star of each new sequence with SUMER.
Parameter List for SUMER Study: jop029
Item # 0
-------------------------------------------------
You have selected (Irrelevant points are not listed.):
1. Interruption or flag mode: No interruption.
2. Slit 7 (centred) with 0.3*120 arcsec^2.
3. Point to FILAMENT
SOHO roll angle: 0.00000 deg
4. Solar rotation: Standard compensation.
5. Binning (spectral) = 1
(spatial) = 1
6. Compression: 5. Quasilog_min_max (0.92 s).
7. Reference pixel 1: 511 on detector A
Flat-field correction: ON
Ion(s) in band 1:
VIRTUAL .... 990.296 Angstroem
Spectral window(s) (pixel): 1024
8. Image format: Format #4 (1024*120, B1); 1 time(s)
9. Spectrohelio mode: Spectrohelio 3
Integration time: 100.000 s
Step size: 0.00000 arcsec or 0 units.
Image number: 1.00000
17. Your selection requires
a mean telemetry rate of: 9.83040 kbit/s
Available bitrate: 10.0000 kbit/s
This item will run
for approximately: 1.68480 minutes
and will cover a solar area defined by
120 px time(s) 0.00000 arcsec
Note that the memory monitoring and the run times are not very
accurate. The run times just give the total exposure times with
a margin of 1%, but the grating focus adjust time is included.
More detailed information can be provided by the SUMER Simulator.
All items up to now will run
for approximately: 1.68480 minutes
You will use for this item: 0.122966 MB
out of which 0.00000 MB are for uncompressed images.
You will have used in total: 0.122966 MB
out of which 0.00000 MB are for uncompressed images.
Parameter List for SUMER Study: jop029
Item # 1
-------------------------------------------------
You have selected (Irrelevant points are not listed.):
1. Interruption or flag mode: No interruption.
2. Slit 7 (centred) with 0.3*120 arcsec^2.
3. Point to FILAMENT
SOHO roll angle: 0.00000 deg
4. Solar rotation: Standard compensation.
5. Binning (spectral) = 1
(spatial) = 1
6. Compression: 5. Quasilog_min_max (0.92 s).
7. Reference pixel 1: 810 on detector A
Flat-field correction: ON
Ion(s) in band 1:
C III .... 977.020 Angstroem
H I .... 972.537 Angstroem
Spectral window(s) (pixel): 50
8. Image format: Format #10 (50*120, B1); 2 time(s)
9. Spectrohelio mode: Spectrohelio 3
Integration time: 4.00000 s
Step size: 1.14000 arcsec or 3 units.
Step number: 105
Step mode: Normal steps
Repetition number: 1
Staggering: 1
17. Your selection requires
a mean telemetry rate of: 24.0000 kbit/s
Available bitrate: 10.0000 kbit/s
This item will run
for approximately: 7.29257 minutes
and will cover a solar area defined by
120 px time(s) 119.700 arcsec
Note that the memory monitoring and the run times are not very
accurate. The run times just give the total exposure times with
a margin of 1%, but the grating focus adjust time is included.
More detailed information can be provided by the SUMER Simulator.
All items up to now will run
for approximately: 8.97737 minutes
You will use for this item: 0.770829 MB
out of which 0.00000 MB are for uncompressed images.
You will have used in total: 0.888794 MB
out of which 0.00000 MB are for uncompressed images.
Parameter List for SUMER Study: jop029
Item # 2
-------------------------------------------------
You have selected (Irrelevant points are not listed.):
1. Interruption or flag mode: No interruption.
2. Slit 4 (centred) with 1*120 arcsec^2.
3. Point to FILAMENT
SOHO roll angle: 0.00000 deg
4. Solar rotation: Standard compensation.
5. Binning (spectral) = 1
(spatial) = 1
6. Compression: 5. Quasilog_min_max (0.92 s).
7. Reference pixel 1: 511 on detector A
Flat-field correction: ON
Ion(s) in band 1:
VIRTUAL .... 1160.70 Angstroem
Spectral window(s) (pixel): 1024
8. Image format: Format #4 (1024*120, B1); 1 time(s)
9. Spectrohelio mode: Spectrohelio 3
Integration time: 100.000 s
Step size: 0.00000 arcsec or 0 units.
Image number: 1.00000
17. Your selection requires
a mean telemetry rate of: 9.83040 kbit/s
Available bitrate: 10.0000 kbit/s
This item will run
for approximately: 1.68480 minutes
and will cover a solar area defined by
120 px time(s) 0.00000 arcsec
Note that the memory monitoring and the run times are not very
accurate. The run times just give the total exposure times with
a margin of 1%, but the grating focus adjust time is included.
More detailed information can be provided by the SUMER Simulator.
All items up to now will run
for approximately: 10.6622 minutes
You will use for this item: 0.122966 MB
out of which 0.00000 MB are for uncompressed images.
You will have used in total: 0.886760 MB
out of which 0.00000 MB are for uncompressed images.
Parameter List for SUMER Study: jop029
Item # 3
-------------------------------------------------
You have selected (Irrelevant points are not listed.):
1. Interruption or flag mode: No interruption.
2. Slit 4 (centred) with 1*120 arcsec^2.
3. Point to FILAMENT
SOHO roll angle: 0.00000 deg
4. Solar rotation: Standard compensation.
5. Binning (spectral) = 1
(spatial) = 1
6. Compression: 5. Quasilog_min_max (0.92 s).
7. Reference pixel 1: 330 on detector A
Flat-field correction: ON
Ion(s) in band 1:
HE I .... 584.334 Angstroem
O I .... 1152.15 Angstroem
Spectral window(s) (pixel): 50
8. Image format: Format #10 (50*120, B1); 2 time(s)
9. Spectrohelio mode: Spectrohelio 3
Integration time: 15.0000 s
Step size: 1.14000 arcsec or 3 units.
Step number: 105
Step mode: Normal steps
Repetition number: 1
Staggering: 1
17. Your selection requires
a mean telemetry rate of: 6.40000 kbit/s
Available bitrate: 10.0000 kbit/s
This item will run
for approximately: 26.9202 minutes
and will cover a solar area defined by
120 px time(s) 119.700 arcsec
Note that the memory monitoring and the run times are not very
accurate. The run times just give the total exposure times with
a margin of 1%, but the grating focus adjust time is included.
More detailed information can be provided by the SUMER Simulator.
All items up to now will run
for approximately: 37.5824 minutes
You will use for this item: 0.00000 MB
out of which 0.00000 MB are for uncompressed images.
You will have used in total: 0.160022 MB
out of which 0.00000 MB are for uncompressed images.
At the end of the study you have to allow for approx.
1.04986 min
to clear the memory.
An integration time of approx. 16.9425 s
would result in an empty memory at the end of the study.
This study ends in a wavelength range (converted to 1st order)
shorter than Lyman alpha.
THE SUMER STUDY SHOULD BE REPEATED 5 TIMES WITH A TOTAL DURATION OF 187.9 MINUTES
Coordinated Ground-based Observations
We will carry out simultaneous Doppler velocity observations of
the chosen filament at the Swedish Observatory at La Palma and
the Sacramento Peak Observatory.Time series of
images and spectra would be taken in H alpha (0,+-0.5 A) and a
magnetically insensitive photospheric line (e.g. Fe I 5576).
We could potentially obtain images of higher resolution
(subarcsecond) than are available from SUMER. The combination
of EUV data and ground-based data should help to clarify the
question of the origin of the filament mass.